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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2017 Konsulko Group Inc. All rights reserved.
*
* Author:
* Pantelis Antoniou <pantelis.antoniou@konsulko.com>
*/
#include <assert.h>
#include <ctype.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <libfdt.h>
#include "util.h"
/* Usage related data. */
static const char usage_synopsis[] =
"apply a number of overlays to a base blob\n"
" fdtoverlay <options> [<overlay.dtbo> [<overlay.dtbo>]]\n"
"\n"
USAGE_TYPE_MSG;
static const char usage_short_opts[] = "i:o:v" USAGE_COMMON_SHORT_OPTS;
static struct option const usage_long_opts[] = {
{"input", required_argument, NULL, 'i'},
{"output", required_argument, NULL, 'o'},
{"verbose", no_argument, NULL, 'v'},
USAGE_COMMON_LONG_OPTS,
};
static const char * const usage_opts_help[] = {
"Input base DT blob",
"Output DT blob",
"Verbose messages",
USAGE_COMMON_OPTS_HELP
};
int verbose = 0;
static int do_fdtoverlay(const char *input_filename,
const char *output_filename,
int argc, char *argv[])
{
char *blob = NULL;
char **ovblob = NULL;
size_t blob_len, total_len;
int i, ret = -1;
blob = utilfdt_read(input_filename, &blob_len);
if (!blob) {
fprintf(stderr, "\nFailed to read '%s'\n", input_filename);
goto out_err;
}
if (fdt_totalsize(blob) > blob_len) {
fprintf(stderr,
"\nBase blob is incomplete (%lu / %" PRIu32 " bytes read)\n",
(unsigned long)blob_len, fdt_totalsize(blob));
goto out_err;
}
ret = 0;
/* allocate blob pointer array */
ovblob = malloc(sizeof(*ovblob) * argc);
memset(ovblob, 0, sizeof(*ovblob) * argc);
/* read and keep track of the overlay blobs */
total_len = 0;
for (i = 0; i < argc; i++) {
size_t ov_len;
ovblob[i] = utilfdt_read(argv[i], &ov_len);
if (!ovblob[i]) {
fprintf(stderr, "\nFailed to read '%s'\n", argv[i]);
goto out_err;
}
if (fdt_totalsize(ovblob[i]) > ov_len) {
fprintf(stderr,
"\nOverlay '%s' is incomplete (%lu / %" PRIu32 " bytes read)\n",
argv[i], (unsigned long)ov_len,
fdt_totalsize(ovblob[i]));
goto out_err;
}
total_len += ov_len;
}
/* grow the blob to worst case */
blob_len = fdt_totalsize(blob) + total_len;
blob = xrealloc(blob, blob_len);
fdt_open_into(blob, blob, blob_len);
/* apply the overlays in sequence */
for (i = 0; i < argc; i++) {
ret = fdt_overlay_apply(blob, ovblob[i]);
if (ret) {
fprintf(stderr, "\nFailed to apply '%s': %s\n",
argv[i], fdt_strerror(ret));
goto out_err;
}
}
fdt_pack(blob);
ret = utilfdt_write(output_filename, blob);
if (ret)
fprintf(stderr, "\nFailed to write '%s'\n",
output_filename);
out_err:
if (ovblob) {
for (i = 0; i < argc; i++) {
if (ovblob[i])
free(ovblob[i]);
}
free(ovblob);
}
free(blob);
return ret;
}
int main(int argc, char *argv[])
{
int opt, i;
char *input_filename = NULL;
char *output_filename = NULL;
while ((opt = util_getopt_long()) != EOF) {
switch (opt) {
case_USAGE_COMMON_FLAGS
case 'i':
input_filename = optarg;
break;
case 'o':
output_filename = optarg;
break;
case 'v':
verbose = 1;
break;
}
}
if (!input_filename)
usage("missing input file");
if (!output_filename)
usage("missing output file");
argv += optind;
argc -= optind;
if (argc <= 0)
usage("missing overlay file(s)");
if (verbose) {
printf("input = %s\n", input_filename);
printf("output = %s\n", output_filename);
for (i = 0; i < argc; i++)
printf("overlay[%d] = %s\n", i, argv[i]);
}
if (do_fdtoverlay(input_filename, output_filename, argc, argv))
return 1;
return 0;
}
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